Electromagnetic relay



y 10, 1956 A. K. DIESEN ET AL 2,754,390

ELECTROMAGNETIC RELAY Filed Jan. 14, 1952 United States Patent CELECTROMAGNETIC RELAY Anton Kristian Diesen, Karl Georg Johnson, andEric Axel Wiberg, Stockholm, Sweden, assignors to Telefonaktiebolaget LM Ericsson, Stockholm, Sweden, a company of Sweden Application January14, 1952, Serial No. 266,264 Claims priority, application Sweden January22, 1951 3 Claims. (Cl. 200-104) The present invention relates to suchelectromagnetic relays as have an armature going along the iron core.The object of the invention is to obtain a simple and cheap relay bysimplifying the device for the suspension of the armature. According tothe invention this is achieved by having the armature, which is cradledagainst an edge at one of the ends of the iron core, both press againstthe edge and be kept in its unactuated position by means of stretchingmeans located in the other end of the iron core.

The invention will be described more closely with reference to theaccompanying drawing. Figs. 1 and 2 show side-views of two differentembodiments of a relay. Figs. 3 and 4 are cross-sections along the linesA-A and 3-13 respectively of the relays according to the Figs. 1 and 2.Fig. 5 shows how several relays can be mounted beside each other on acommon supporting bar.

The electromagnetic relay shown in Fig. 1 has an armature 11, which isgoing along the iron core and is cradled against an edge 12 at the backend of the iron core. At the front end of the iron core there is aspring 13, one terminal of which is fastened to an adjustable screw 14on the iron core, the spring being arranged to exert such an attractionon the armature, that it both presses the armature against the edge 12by means of its back portion 17 and keeps it in the unactuated positionshown in Fig. 1. This takes place so, that the spring 13 is fastened toa lifting screw on the armature 11, the screw being in its upper endprovided with a nut 18, the lower edge of which is drawn towards theiron core 10 under action of the spring 13. Upon action of said nut, thedistance of the armature to the iron core can be adjusted. When thewinding 19 of the armature is energized, the front portion of thearmature is drawn upwards towards the iron core, the lifting screw 15thereby also being drawn upwards and lifting the actuating means 21 ofthe contact springs 20, so that the illustrated four closed contacts arebroken.

The edge 12, against which the back portion of the armature presses,consists of two side pieces 16 placed on both sides of the iron core 10as appears from Fig. 3. By means of screws 31, 32 the side pieces andtherewith also the edge 12 are fastened to the iron core. The edge hasbeen placed so, that a line drawn from the edge to the upper surface ofthe lifting screw 15 on the nut 18, Fig. 1, is chiefly parallel to thelongitudinal axis or central line 33 of the iron core. The two ends ofthe iron core 10 are at the parts lying nearest to the armature 11,shaped as magnetic poles for the armature, said poles attracting thearmature in the same direction as it actuates.

The embodiment of the relay shown in Figs. 2 and 4 ditfers from the oneshown in Figs. 1 and 3 only by the connection of the contact spring setand the iron core to each other.

The contact springs shown in Figs. 1 and 3 are arranged in a set whichis directly fixed to the back end of the iron core by means of a screw22, Figs. 1 and 3. There are 2,754,390 Patented. July 10, 1956 twofurther screws 23 and 24 for guiding the contact springs in the set. Atthe front end of the iron core the contact spring set is guided by arecess in a flange 25 on the iron core.

As distinguished therefrom, the contact springs 40 according to Figs. 2and 4 are fixed by means of studs 41 on guiding flanges 42 of'insulatingmaterial, no layers separating the springs. At the same flanges 42 theiron core 50 and the side pieces 56 are fixed by means of screws 51, 52.

The shown side-pieces 16 and 56 are provided with recesses 57 to allowsingle relays to be fixed to a supporting rib 58, Figs. 1, 2 and 5,common to one or several relays. (Said supporting rib is not shown inFigs. 3 and 4). In Fig. 5, a relay mounted on said supporting rib isshown; it is fixed by means of the screw 59 shown in Figs. 1 and 2.Besides said mounted relay, other relays can be fixed to the supportingbar according to Fig. 5 at the shown recesses 60 and similar, not shownrecesses, located beside the shown ones.

We claim:

1. An electromagnetic relay comprising an actuating coil having an ironcore and an elongated armature having an offset hook portion at one end,a core member having two ends, a first edge at one end of said coreengaged by said hook portion of said armature, resilient tension meansat the other end of said armature connected to the other end of saidcore to exert a pull to keep said hook portion of the armature inengagement with the pivot edge and to exert a pivotal force biasing theother end of the armature away from said core, a plurality of contactsprings, a lifting screw on the said other end of said armature piercinga portion of said core member and having an adjusting nut, actuatingmeans on said contact springs extending toward said lifting screw, thesaid adjusting nut acting to limit the unenergized position of saidarmature.

2. A relay comprising in combination an electromagnet, an iron core insaid electromagnet, an elongated armature extending parallel to saidcore and adapted to be attracted thereto, means on one end of saidelectromagnet forming an edge adjacent one end of said iron core, saidarmature having one end thereof bent to be pivotally received by saidedge, an element secured to the other end of said core forming an obtuseangle therewith and extending beyond the other end of said armature, aspring resiliently joining between the distal end of said element andthe said other end of said armature to apply a tension force thereto andsimultaneously press the said one end of said armature against said edgeto bias the said other end of said armature away from said core, aplurality of contact springs arranged to be actuated by motion of saidarmature, a lifting screw fixed on the said other end of said armaturepiercing said core and having an enlarged member thereon to engage thecore and limit the motion of said armature when the electromagnet isunenergized.

3. The invention as set forth in claim 2, including means connected tosaid contact springs and extending toward said lifting screw to transmitarmature thrust to the said contact springs.

References Cited in the file of this patent UNITED STATES IATENTS1,645,897 Crowe Oct. 18, 1927 2,077,091 Brander Apr. 13, 1937 2,107,848Barrett Feb. 8, 1938 (Other references on following page) UNITED STATESPATENTS Vigren et a1 May 12, 1942 Zupa July 13, 1943 Graybill et a1 Feb.13, 1951 Jorgensen et a1. Jan. 8, 1952 Juillard 4..-..- Dec. 9, 1952 4FOREIGN PATENTS Denmark Mar. 29, 1926 Norway Mar. 21, 1949 Sweden Mar.4, 1937 Great Britain May 5, 1930 France Dec. 15, 1950

